/**buffer of kernel and i/o*/
#include<errno.h>
#include<stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>

int main(void){
	printf("printf");
	write(STDOUT_FILENO,"write\n",6);
	exit(0);
}
